fbi officials have already said their investigation has not turned up any threat to national security. >>> san francisco's sheriff says he wouldn't give up department oversight over domestic violence programs. in a letter obtained by the "san francisco chronicle," ross mirkarimi says he is confident that he doesn't face any conflict of interest. that's after mirkarimi got into a fight with his wife on new year's eve and bruised her arm. now he is on probation for a misdemeanor. and coming up at 6:45, cbs 5 political insider phil matier will sit down with the sheriff for a one-on-one conversation. >>> the president of chico state has us is spended all greek activities -- suspended all greek activities on campus after a series of problems with underaged drinking, hazing and fights. the latest, the death of mason sumnicht who was pledging a fraternity. the university says he tried to take 21 shots for his 21st birthday. mason from the san diego area suffered brain damage and died yesterday. >> mason's loss has enabled me to provide a wake-up call for everyone. >> shutting down the greek